US Patent 7326368 - Toxicity reduction of liquid metal using nanoparticles

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This patent from Japan Nuclear Cycle Development Institute discloses the use of nanoparticles to reduce reactivity and enhance flow resistance of liquid metals used in coolants for nuclear reactors. Claims 1 and 5 reads:

1. A method of reducing reactivity or toxicity in a liquid metal heat transfer medium consisting of the liquid metal itself by dispersing nano-particles selected from the group consisting of metals, alloys and metallic compounds in the liquid metal.

5. A method of enhancing flow resistance in a liquid metal heat transfer medium consisting of the liquid metal itself by dispersing nano-particles selected from the group consisting of metals, alloys and metallic compounds in the liquid metal.